Compilare: user.cpp: In function ‘int queryTree()’: user.cpp:16:9: warning: unused variable ‘left’ [-Wunused-variable] int left = 1; ^ user.cpp:17:9: warning: unused variable ‘right’ [-Wunused-variable] int right = n + 1; ^ user.cpp: In function ‘int main()’: user.cpp:50:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ user.cpp:53:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", V + i); ^